ZIp them on in a criss cross pattern with the impact, but just barely get the nuts touching the cones. Then go around in a criss-sross pattern and give them just a little tap with the impact. Then put it on the ground and use a torque wrench on each. For a car with 7/16' lugs and steel wheels, I usually go 70 ft/pounds. 1/2" I go 80. Aluminum wheels are thicker so I go about 10 lb tighter. Or see if you can look up the factory specified tork in the manual or on line.